The invention discloses a manufacturing method of a lining garment front overlap slit structure. The manufacturing method comprises the following steps: 1, cutting a left clothes piece cover A and a right clothes piece cover B as well as a left clothes piece lining A' and a right clothes piece lining B' corresponding to the left clothes piece cover A and the right clothes piece cover B, enabling seam allowances in slit positions of the left and right clothes piece covers A and B to be 1 to 2 cm, and enabling the seam allowances 2 above slits to be flush with the seam allowances in the slit positions of the lower side; 2, sewing and topstitching the outer sides of the left and right clothes piece covers A and B from top to bottom along the seam allowances, turning to a slit stop point P when sewing to the position of a slit opening O, and sewing to the slit stop point P; 3, folding and ironing the slit positions of the left and right clothes piece covers; 4, topstitching the left and right clothes piece linings A' and B' to the slit stop point P from top to bottom, and enabling seam allowances in slit positions of the left and right clothes piece linings to respectively correspond to the seam allowances in the slit positions of the left and right clothes piece covers; 5, respectively folding and ironing slit sewing positions of the left and right clothes piece linings and sewing positions of the left and right clothes piece linings. According to the manufacturing method disclosed by the invention, the model structure and the sewing way of the clothes piece linings are improved, slit forced positions are changed from points into surfaces, and the problems of slitting and tearing of the covers, fur leakage of the linings and complicated operation are completely eradicated.